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Chad Dewitt
- Gutter Design & Architecture
5-Inch vs. 6-Inch Gutters: How Much Bigger Are They Really?
When comparing 5-inch vs. 6-inch gutters, the difference sounds simple: one inch. But how much additional water can a 6-inch gutter actually hold? The answer might surprise you.
In this episode of Gutter Talk with Chad Dewitt, owner of NorthStar Seamless Gutters, gets out the chalkboard to explain the real difference between the two sizes.
The short answer: A 6-inch gutter can hold approximately 50% more water than a comparable 5-inch gutter, depending on the exact profile and manufacturer. But that doesn’t automatically mean every home needs the larger size.x
Let’s look at the numbers, why they matter, and how to decide which gutter size is right for your home.
5-Inch vs. 6-Inch Gutters: The Capacity Difference
Here’s where things get interesting.
Most people naturally assume a 6-inch gutter holds about 20% more water than a 5-inch gutter because it’s 20% wider.
But gutters aren’t flat surfaces. They’re three-dimensional channels, and their ability to hold water depends on the entire shape of the profile.
Using the gutter profiles illustrated in our video, here’s how the numbers compare:
| Measurement | 5-Inch Gutter | 6-Inch Gutter |
|---|---|---|
| Nominal gutter width | 5 inches | 6 inches |
| Approximate forming coil width | 12 inches | 15 inches |
| Water held per 10 linear feet | 6.1 gallons | 9.45 gallons |
| Relative holding capacity | 100% | 155% |
| Common application | Homes with moderate drainage demands | Larger roof areas or higher runoff demands |
These are representative holding-capacity figures from NorthStar’s comparison, These are NOT universal manufacturer specifications or measured drainage flow rates.
How Much More Water Does a 6-Inch Gutter Hold?
Let’s use the actual numbers from my chalkboard:
- 5-inch gutter: 6.1 gallons per 10 linear feet
- 6-inch gutter: 9.45 gallons per 10 linear feet
- Additional capacity: 3.35 gallons
The calculation is straightforward:
(9.45 − 6.1) ÷ 6.1 × 100 = 54.9%
That’s approximately 55% more water-holding capacity from a gutter that’s only one inch wider.
It’s important to understand that this isn’t an exact percentage across every gutter system. Different forming machines and gutter profiles produce slightly different shapes and dimensions.
In my experience, capacity differences between comparable 5-inch and 6-inch profiles can range from approximately 45% to 55%.
For homeowners, 50% more holding capacity is a useful general estimate, with the actual difference depending on the installed profile.
Why Gutter Size Matters During Heavy Rain
A larger gutter isn’t simply about holding more water. It’s about giving your drainage system enough capacity to manage the runoff coming off your roof.
As explained in the video, just one inch of rainfall across approximately 2,000 square feet of roof area represents around 1,200 gallons of water.
That’s a tremendous amount of water moving toward your gutters.
When a roof receives heavy rainfall, multiple factors determine whether the gutter system can manage that water:
- The amount of roof area draining into each gutter section
- The pitch and layout of the roof
- The intensity of the rainfall
- The gutter profile and dimensions
- The size, number, and placement of downspouts
- Whether debris is restricting drainage
A larger gutter offers additional storage capacity, but the entire system must be designed to move water away efficiently.
A 6-inch gutter with poorly sized or obstructed downspouts can still overflow.
That’s why proper gutter sizing should always consider more than just the width of the gutter itself.
When Are 5-Inch Gutters the Right Choice?
Five-inch gutters remain a practical and effective solution for many residential properties.
If your home has a relatively straightforward roofline, moderate roof area, and a properly designed drainage system, 5-inch seamless gutters may provide everything you need.
Five-inch gutters may be a good fit when:
- The roof doesn’t collect unusually large volumes of runoff into individual sections.
- Existing drainage has performed well during heavy rainfall.
- The system has adequate downspouts and proper gutter pitch.
- A smaller gutter profile is preferred for appearance or budget.
At NorthStar, we don’t believe every homeowner needs to upgrade to 6-inch gutters.
The goal is to install a system that’s appropriate for the property—not sell the largest gutter available.
When Should You Consider 6-Inch Gutters?
Six-inch gutters become especially valuable when the roof produces more runoff than a smaller system can reliably manage.
You may benefit from 6-inch seamless gutters if your home has:
A large roof area: More roof surface means more water collecting during a storm, particularly when several roof sections feed into one gutter run.
Steep roof pitches: Roof geometry can increase the drainage demand used when sizing a gutter system. Steeper rooflines also deserve careful attention to runoff speed and gutter placement.
Long gutter runs: Long sections collecting runoff from substantial roof areas may require additional gutter capacity, more downspouts, or both.
Concentrated drainage areas: Roof valleys and intersecting rooflines can direct significant amounts of water into relatively small sections of gutter.
Recurring overflow problems: If properly cleaned gutters consistently overflow during heavy rain, the system may be undersized or inadequately drained.
Upgrading to 6-inch gutters can create additional capacity, but it’s not a universal fix for drainage problems. Downspout placement, slope, outlet sizing, and installation quality remain just as important.
Are 6-Inch Gutters Worth the Extra Cost?
One of the most important points I make in the video is that homeowners should consider the additional value of a larger gutter system rather than looking only at its price.
Suppose upgrading to a 6-inch system increased the cost of a project by 20%.
If the selected 6-inch profile offered approximately 50% more holding capacity, that could represent a worthwhile improvement for a home that needs it.
However, that 20% figure is only an example—not a guaranteed price difference.
The actual cost of 5-inch vs. 6-inch gutters depends on the materials, gutter profile, length of the installation, downspout requirements, and complexity of the property.
For some homes, the added capacity may be valuable. For others, properly installed 5-inch gutters will do the job without the additional expense.
The best investment is a gutter system correctly sized for your home’s drainage needs.
Choosing the Right Gutter Size for Wisconsin Homes
For homeowners throughout Eau Claire, Chippewa Falls, Menomonie, and the surrounding Chippewa Valley, gutter sizing is particularly important.
Wisconsin properties experience a wide variety of drainage conditions, from heavy summer thunderstorms to spring snowmelt and repeated freeze-thaw cycles.
An undersized or poorly configured drainage system can contribute to overflowing gutters, saturated landscaping, water near the foundation, and deterioration around the roofline.
At NorthStar Seamless Gutters, we evaluate the roof and drainage requirements of each property before recommending a system.
We consider roof pitch, runoff patterns, downspout placement, gutter profile, and the installation details needed for reliable performance.
We also offer multiple gutter styles, including 5-inch and 6-inch K-style and specialty gutter profiles, so the final system can complement your home’s architecture.
Whether your property needs a straightforward 5-inch seamless system or the additional capacity of 6-inch gutters, the recommendation should be based on the home itself.
Learn more about our seamless gutter installation services in Eau Claire, Wisconsin.
Frequently Asked Questions About 5-Inch and 6-Inch Gutters
Are 6-inch gutters better than 5-inch gutters?
Not necessarily. Six-inch gutters provide greater holding capacity, which can be beneficial on roofs with significant runoff. However, properly sized 5-inch gutters can perform very well on homes with moderate drainage demands.
How much more water can a 6-inch gutter hold?
In the profiles demonstrated by NorthStar, a 6-inch gutter holds approximately 9.45 gallons per 10 linear feet, compared to 6.1 gallons for a 5-inch gutter. That’s roughly 55% more holding capacity. The exact percentage varies with the gutter’s shape and manufacturer.
Do 6-inch gutters prevent overflowing?
Larger gutters may help reduce overflow caused by insufficient gutter capacity, but they cannot compensate for every drainage problem. Clogged gutters, inadequate downspouts, improper slope, and concentrated roof runoff can still lead to overflowing water.
Are 6-inch gutters more expensive?
Generally, yes. Larger gutters typically require more material, and total costs also depend on the downspouts, accessories, and installation. A professional estimate can show whether the added capacity justifies the additional cost for your home. NorthStar estimates about a 20% increase in cost for a 6-inch Gutter system verses a 5-inch gutter system, however, you will gain an estimated 50% increase in water capacity with the 6-inch gutter system.
How do I know what size gutters my house needs?
The best way is to have a qualified gutter professional evaluate the roof area, roof pitch, drainage layout, local rainfall conditions, and downspouts. Your roof’s overall square footage alone doesn’t tell the whole story.
Let NorthStar Help You Choose the Right Gutters
Choosing between 5-inch and 6-inch gutters shouldn’t be a guessing game.
With more than 25 years of gutter experience, Chad Dewitt and NorthStar Seamless Gutters help homeowners throughout the Chippewa Valley select gutter systems that fit their homes, budgets, and drainage requirements.
Whether you’re replacing an aging system, building a new home, or trying to solve an ongoing overflow problem, we’ll help you understand your options.
Get the right gutter system for your home, not simply the biggest one available.
Request a Free Gutter Estimate
Or call Chad directly at (715) 797-7497.
NorthStar Seamless Gutters proudly serves Eau Claire, Chippewa Falls, Menomonie, and communities throughout Western Wisconsin.
